The mass of the stoichiometric reactant mixture is mol g 49 117 mol 3 mol g 98

# The mass of the stoichiometric reactant mixture is

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yields 2677 kJ of energy. The mass of the stoichiometric reactant mixture is: ! " # \$ % & + ! " # \$ % & mol g 49 . 117 mol 3 mol g 98 . 26 mol 3 = 433.41 g For 1.000 kg of fuel: 1.000 × 10 3 g × g 41 . 433 kJ 2677 ! = 6177 kJ In Exercise 71, we get 4594 kJ of energy from 5 mol of N 2 O 4 and 4 mol of N 2 H 3 CH 3 . The mass is: ! " # \$ % & + ! " # \$ % & mol g 08 . 46 mol 4 mol g 02 . 92 mol 5 = 644.42 kJ For 1.000 kg of fuel: 1.000 × 10 3 g × g 42 . 644 kJ 4594 ! = 7129 kJ Thus we get more energy per kilogram from the N 2 O 4 /N 2 H 3 CH 3 mixture. 74. a. C 2 H 4 (g) + O 3 (g) CH 3 CHO(g) + O 2 (g) Δ H° = 166 kJ (143 kJ + 52 kJ) = 361 kJ b. O 3 (g) + NO(g) NO 2 (g) + O 2 (g) Δ H° = 34 kJ (90. kJ + 143 kJ) = 199 kJ c. SO 3 (g) + H 2 O(l) H 2 SO 4 (aq) Δ H° = 909 kJ [ 396 kJ + (-286 kJ)] = 227 kJ d. 2 NO(g) + O 2 (g) 2 NO 2 (g) Δ H° = 2(34) kJ 2(90.) kJ = 112 kJ
CHAPTER 9 ENERGY, ENTHALPY, AND THERMOCHEMISTRY 374 Even-numbered Problem Solutions o f o × 5 8
CHAPTER 9 ENERGY, ENTHALPY, AND THERMOCHEMISTRY 375 Even-numbered Problem Solutions Additional Exercises Δ (PV) 3 kJ ! !
CHAPTER 9 ENERGY, ENTHALPY, AND THERMOCHEMISTRY 376 Even-numbered Problem Solutions

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